The National Capital Planning Commission and the D.C. Office of Planning have been studying the impacts of raising D.C.'s height limits. Recently, DCOP released a series of renderings showing what D.C. would look like if the height limit was raised.
Check them out here
, but consider that it's likely that not all buildings would rise to exactly the tallest height allowed. D.C. Office of Planning director Harriet Tregoning said in a discussion (quoted
on Twitter) that the models represent "worst-case scenarios."